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(No Model.) 4 Sheets;heet 1.

H. HOPFMEISTER & E. FRIEDRICH.

Atmospherical Steam Engine. No. 239,955. PatentedApriHZ, 1881.

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NFETE RSv FHOTKLLITHOGRAPHER, WASHINGTON. D: C,

(No Mbael.) r 4 Sheets-Sheet 2. H. HOFFMEISTER & E; FRIEDRICH. Atmospherical SteamKE-ngine.

No. 239,955. Patented April 12,1881;

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Atmospherioal Steam Engine.

.NO. 239,955. Patented April 12,1881,-

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NIPEERS. PHOTO-LITMOGRAFHER. WASHINGTON a c UNITED STATES PATENT OFFICE.

HERMANN HOFFMEISTER AND EDMUND FRIEDRICH, OF MEIDLING, AUSTRIA.

ATMOSPHERICAL STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 239,955, dated April 12, 1881 Application filed October 25, 1880 (No model.) Patented in Austria January 23, 1879. I

To all whom 'it may concern Be it known that we, HERMANN HOFFMEIS- tune and EDMUND FRIEDRICH, both of the city of Meidling, in the Empire of Austria, have invented a new and useful Atmospherical Steam-Engine, of which the following is a specification. V

Our invention relates to in'iprove'ments in single acting atmospherical steam engines, more particularly intended for family use; and the objects of our improvements are, first, to provide a new mechanism for distributing the steam directly by the piston; second, the automatic water-supply, also by the piston; and, third, an inexplosive steam generator. We obtain these objects by the mechanism illus trated in the accompanying drawings, in which Figure l is a vertical longitudinal section of the machine; Fig. 2, a plan of the heating mechanism; Fig. 3, a plan of the entire machine; Fig. 4-, a vertical cross-section of the same; Fig. 5, a horizontal section of the cylinder with the piston, and the Figs. 6 to 10 show the positions of the entry and outlet openings of the steam during the ascent and descent of the piston.

Similarletters of reference indicate similar parts in all the figures.

The engine consists of an inexplosive steamgenerator, A, and a cylinder, B, open at one end, in which the piston 0 works, distributing the steam, and at the same time regulating the water-supply. To themachine belongs, further, a surfacecondenser or water-tank, E, provided I with a serpentine pipe, G, through which the exhaust-steam passes.

The steam is generated in small brass pipes, at a, and on the top and the sidewalls of that part of the fire-box F which projects into the steam-generator A.

Small motors are heated by gas, petroleum, 850., and larger ones by coal, coke, wood, 850.

The top of the box F, which forms the bottom of the steam-generator A, is made from a round corrugated sheet, a, of steel, which is bulged more or less by the pressure of the steam in the generator, and regulates thereby the supply of gas to the burner D by opening or closing the valve b. This valve b is so regulated that when the motor stops only the necessary quantity of gas or other vapor or fluid is allowed to pass, suflicient to maintain the desired steam-pressure.

0n the top of the piston U a projection, C, is provided, with a suitable opening in which a cam, d, on the shaft d works. During the motion of the piston U and shaft d the action of the cam d will cause this projection O, and r desired amount of cut-off is obtained.

Figs. 6 to 10 show the positions of the openings and this groove during the ascent and descent of the piston. Fig. 6 shows the beginning of the steam-supp] y and ascent of the piston. In Fig. 7 the piston O is just in the middle of its stroke. Fig. 8 shows the beginning of theexpansion. The inlet-openin g j is just closed. Fig. 9, the piston is in its highest position, or at its top stroke. In the next moment the action of the cam (1 will turn the piston U, bringing the groove 0 before the outlet-passage g. Fig. 10 shows the piston at halfstroke, descending, and the outlet 9 entirely open. i

The exhaust-steam passes through the pipe G into the serpentine pipe G in the water-tank E, and then into the collecting-box m, where the condensed water is collected. This box m serves to collect the condensed water and to equalize the supply of the feed-water. On top of the box m a small air-valve, h, is provided. The condensed water passes from the box at through a pipe, H, to a chamber, J, in the cylinder, and from there into a groove, K, or recess made in the piston 0. During the descent of the piston the grpove K comes opposite to. a chamber, L, likewise arranged in the cylinder B, and this condensed water escapes thus into this chamber L, back into the steam-generator A. The groove or recess K will be filled with steam each time after the water has been discharged, but this steam is condensed by the contact with the fresh supply of feed-water IOO seen that the steam passing at one side from the generatorA to operate the piston is brought back as condensed water at the other side to the steam-generator.

The vacuum produced below the piston after the escape and condensation of the steam serves, in connection with the atmospheric pressure upon the top of the piston, to move the same downward.

p p p are outlets for the heated gases from the tire-box F.

The joint of the connecting-rod s is made movable in its turning-pin r, to allow for the turning of the piston in the manner and for the purpose above described.

What We claim as our invention, and desire to secure by Letters Patent, is

1. In combination with cylinder B, pitman S, and shaft (1, the piston 0, having a slotted upper extension or frame, and grooved to engage alternately with the inlet and exhaust ports of said cylinder, the cam 61, carried by said shaft and turning in said slotted extension or frame, whereby a vibratory as Well as a reciprocatory motion isiniparted to said piston, for the purpose set forth.

2. In an atmospheric steam-engine, the cylinder B, provided with a chamber, J, connected with a feed-water chamber, m, and with a chamber, L, connected to the top of the steam-gem erator, in combination With a piston, 0, provided with a recess or cavity, K, arranged to operate substantially in the manner and for the purpose specified.

3. In an atmospheric steam-engine, the combination of the steam-generator A, burner D, having its supply automatically regulated by the steam-pressure, the cylinder B, with cavities L and J, the vertically-mox ing piston 0, provided with recess K and groove e, and projecting frame 0, operated by a cam, d, and the exhaust-pipe G and feed-water pipe H, and the condensing-tank E, the whole being constructed and arranged to operate in the manner and for the purpose herein described and specified.

HE RMANN HOFFMEISTER. EDMUND FRIEDRICH.

Witnesses FERDINAND HAR'IINANN, FRANZ POSTAWKA. 

